The GeneralAire Whole House 1099LHS Legacy Humidifier is a perfect solution for fresh clean air to any household. The 1099LHS Legacy Humidifier can reduce asthma and allergy symptoms to ensure minimized risks to infections to your family. The Legacy Series Humidifier receives warm air from the furnace and sends it through a water-soaked Vapor Pad inside the humidifier to absorb moisture. This newly moistened clean and fresh air is then distributed throughout your home.